Thread-cutter.



No. 659,975. Patented 0st. l6. I900.

n. N. JERAULD.

THREAD CUTTER.

(Application flied Apr. 23, 1900. (No Model.) 2 Sheets-Shoat l.

W/TNESSES I L //v VENTOI? I I DZuarg'MJerauld. I 1' V A EYS' THE NORRIS Pzrzns co, pwmuumnu msmuoroa, u c

No. 659,975. Patented Oct. l6, I900.

n. ERAULD.

T H C U T T E R.

lication filed Apr. 23, 190' A 77'0HNEYS i 1 uvvavroe i MJerauld.

time Sterne DLUAREJ NOR WOOD JERAULD, OF BUFFALO, NEW YORK.

THREAD QUTTER.

SPECIFICATION forming part of Letters Patent No. 659,975, dated October 16, 1900.

Application filed April 23, 1900. Serial No. 13,922. (No model.)

To (tl whom, it may concern:

Be it known that I, DLUAREJ Nonwoon JERAULD, a citizen of the United States, and a resident of Buffalo, in the county of Erie and State of New York, have invented a new and Improved 'lhread-Outter, of which the following is a full, clear, and exact description.

This invention relates to improvements in portable hand-power machines for cutting threads on pipes and rods of different gages; and the object of the invention is to improve the general construction of this class of devices, as well as to reduce and simplify the number of working parts.

I will describe a thread-cutter embodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional elevation of a threadcutter embodying my invention. Fig. 2 is a section on thelinem :t' of Fig. 1. Fig. 3 isasection on the line y y of Fig. 1. Fig. 4. is asection on the line .2 of Fig 1, and Fig. 5 is a fragmentary View showing a means for adjusting and clamping the cutting device.

Referring to the drawings, 1 designates the tubular casing of the machine, open at both ends. In a casing 2 at one end of the casing 1 are clamping-jaws 3 at, adapted to engage with a pipe or similar device for holding it rigidly in place while cutting a thread thereon. These jaws also operate to center the pipe, inasmuch as the jaws will move toward and from each other by means of right and left hand screw-threads on a screw-shaft 5,

extending upward through the casing2and having a hand-wheel 6 on its outer end.

Movable longitudinally in the casing 1 is a cylinder 7, having a thread 8 on its outer surface for engaging with a threaded feed-block 9. The threaded feed-block 9 is adjustable to engage with the thread 8 or to move from engagement therewith by means of a screw rod 10, engagingin a tapped plate 11, removably attached to the casing 1, as clearly indicated in Fig. 1. On the rear end of the cylinder 7 is a gear 12, adapted to be rotated by a pinion 13, which is of a suitable length to permit the gear 12 to slide thereon while the said gear is receiving rotary motion from the pinion. This pinion 13 is seated in a recess let, formed in the casing 1, and it has an outwardly-extended shaft 15, to which a suitable turning-tool may be applied.

A die-carrier is attach ed to the forward end of the cylinder 7. This carrier has a laterally-extended flange 16 and a forwardly-extended peripheral flange 17. It also has a forwardly-extended flange 18, provided with a series of openings 1.) for the passage of the threading device 20. Asa means for adjusting the threading device inward or outward I provide a worm-whee1 21 for each die. This wormwheel engages with teeth formed in the die, and it will be noted that the shaft of the worm-wheel has its hearings in the flanges 17 and 18. On the shaft of each worm-wheel is a pinion 22, and all of the pinions are engaged with a rack on a ring 23. The rackring is held from outward movement by means of a stop-ring 24:, attached by screws or otherwise to the outer end of the die-carrier. The rack-ring may be moved in a rotary di' rection when desired to move the dies inward or outward by means of a pin 25, which extends outward through an arc slot 26, formed in the stop ring 24. This pin 25 may be screw-threaded and provided with a thumbnut 26, so as to hold the rack as adjusted, and consequently holding the dies rigidly as adjusted, and as a further means for thus rigidly holding the parts a block 27 may be attached to the rack-ring and extended into the slot 26, and on this block is a threaded stud engaged by a set-nut 28.

In operation when a pipe or rod is in position and the thread-cutting dies engage therewith motion imparted to the cylinder 7 through the medium of the gears 12 and 13 will by its engagement with the feed-block 9 cause said cylinder to recede, and this of course will move the die-carrier, causing the dies to move lengthwise of the end of the pipe during their movement around the pipe, thus cutting the thread. When the thread is cut, the feed-block 9 may be raised and the cylinder 7 drawn forward, ready for new work without running back, by its thread connections. The pipe or rod of course will be rigidly held and properly centered by the jaws scribed.

3 and 4. Therefore Iterm these ja ws, a selfcentering vise.

Should it be found necessary to remove a bur from the thread, which may sometimes be left by the dies, the mechanism can be reversed, causing the dies to pass over the threads in the opposite direction, leaving a clean cut, and if'no burs are present the device can be retracted or drawn outward by means of the ring-shaped rack, as before de- It will be noted that the gear-shaft rack is supported by and rotates upon the inner flange 18 of the die-carrier.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a thread-cutting machine, a casing, a

cylinder mounted in the casing, means for imparting a lengthwise movement to said cylinder, means for imparting rotary movement to the cylinder, a die-carrier attached to the forward end of said cylinder, consisting of an outwardly-extended portion and inner andouter forwardly-extended flanges, dies movable through openings in 'the inner flange, worm-wheels engaging with said dies, pinions on the shafts of the worm-wheels, a ringshaped rack engaging with the several pinions, the said rack being mounted to rotate on, the said innerfiange, a stop-ring attached to the outer flange, and a pin or the like extended from said rack through an arc slot in the stop-ring, substantially as specified.

2. In a thread-cutting machine, a casing, a cylinder mounted in the casing and having an exterior thread, a feed-block for engaging with said thread, a gear attached to the rear end of said cylinder, an elongated pinion with which said gear engages, a die-carrier attached tothe forward end of said cylinder,

consisting of an outwardly-extended portion and inner and outer forwardly extended DLUAREJ NORWOOD JERAULD.

Witnesses:

FRED ALBERT RUG, WILLIAM P. COLGAN. 

